Re: [PATCH v5 net-next 4/4] sfc: remove expired unicast PTP filters

[Edward Cree <ecree.xilinx@gmail.com>]

On 27/03/2023 11:57, Íñigo Huguet wrote:
> Filters inserted to support unicast PTP mode might become unused after
> some time, so we need to remove them to avoid accumulating many of them.
> 
> Refresh the expiration time of a filter each time it's used. Then check
> periodically if any filter hasn't been used for a long time (30s) and
> remove it.
> 
> Reported-by: Yalin Li <yalli@redhat.com>
> Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
> ---
...
> @@ -1378,8 +1394,12 @@ static int efx_ptp_insert_filter(struct efx_nic *efx,
>  	rxfilter->ether_type = spec->ether_type;
>  	rxfilter->loc_port = spec->loc_port;
>  	memcpy(rxfilter->loc_host, spec->loc_host, sizeof(spec->loc_host));
> +	rxfilter->expiry = expiry;
>  	list_add(&rxfilter->list, filter_list);
>  
> +	queue_delayed_work(ptp->workwq, &ptp->cleanup_work,
> +			   UCAST_FILTER_EXPIRY_JIFFIES);

Why not +1 here...

> +static void efx_ptp_cleanup_worker(struct work_struct *work)
> +{
> +	struct efx_ptp_data *ptp =
> +		container_of(work, struct efx_ptp_data, cleanup_work.work);
> +	struct efx_ptp_rxfilter *rxfilter, *tmp;
> +
> +	list_for_each_entry_safe(rxfilter, tmp, &ptp->rxfilters_ucast, list) {
> +		if (time_is_before_jiffies(rxfilter->expiry))
> +			efx_ptp_remove_one_filter(ptp->efx, rxfilter);
> +	}
> +
> +	if (!list_empty(&ptp->rxfilters_ucast)) {
> +		queue_delayed_work(ptp->workwq, &ptp->cleanup_work,
> +				   UCAST_FILTER_EXPIRY_JIFFIES + 1);
> +	}

... like you have here?  (Or vice-versa.)
Other than that LGTM.